Print an error message and exit with a non 0 status when no YAML test is found.
Print an error message and exit with a non 0 status when no YAML test is found.

SophieIPP/openfisca-france,adrienpacifico/openfisca-france,benjello/openfisca-france,antoinearnoud/openfisca-france,antoinearnoud/openfisca-france,sgmap/openfisca-france,adrienpacifico/openfisca-france,benjello/openfisca-france,sgmap/openfisca-france,SophieIPP/openfisca-france